Bug 1575472 (CVE-2018-1120)

Summary:	CVE-2018-1120 kernel: fuse-backed file mmap-ed onto process cmdline arguments causes denial of service
Product:	[Other] Security Response	Reporter:	Doran Moppert <dmoppert>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	airlied, aquini, bhu, blc, bskeggs, dhoward, dmoppert, esandeen, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jrybar, jwboyer, kdudka, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, nmurray, plougher, rt-maint, rvrbovsk, security-response-team, skozina, slawomir, steved, vdronov, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.17	Doc Type:	If docs needed, set a value
Doc Text:	By mmap()ing a FUSE-backed file onto a process's memory containing command line arguments (or environment strings), an attacker can cause utilities from psutils or procps (such as ps, w) or any other program which makes a read() call to the /proc/<pid>/cmdline (or /proc/<pid>/environ) files to block indefinitely (denial of service) or for some controlled time (as a synchronization primitive for other attacks).	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:21:22 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1576338, 1576339, 1576340, 1576341, 1576342, 1579541, 1579542, 1836953
Bug Blocks:	1575855

Description Doran Moppert 2018-05-07 04:15:21 UTC

By mmap()ing a FUSE-backed file onto a process's memory containing command line arguments (or environment strings), an attacker can cause utilities from psutils or procps (such as ps, w) or any other program which makes a read() call to the /proc/<pid>/cmdline (or /proc/<pid>/environ) files to block indefinitely (denial of service) or for some controlled time (as a synchronization primitive for other attacks).

External references:

http://seclists.org/oss-sec/2018/q2/122

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f7ccc2ccc2e70c6054685f5e3522efa81556830

Comment 12 Adam Mariš 2018-05-16 11:17:45 UTC

Acknowledgments:

Name: Qualys Research Labs

Comment 13 Vladis Dronov 2018-05-17 21:13:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1579542]

Comment 15 errata-xmlrpc 2018-10-30 07:33:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3083 https://access.redhat.com/errata/RHSA-2018:3083

Comment 16 errata-xmlrpc 2018-10-30 07:39:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3096 https://access.redhat.com/errata/RHSA-2018:3096

Comment 17 errata-xmlrpc 2018-10-30 09:01:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948

Comment 24 errata-xmlrpc 2020-09-22 11:38:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support
  Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2020:3804 https://access.redhat.com/errata/RHSA-2020:3804

Comment 25 errata-xmlrpc 2020-09-22 14:52:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2020:3810 https://access.redhat.com/errata/RHSA-2020:3810